Remove the thread from the machine. (Always raise the presser foot and pull the thread up, NEVER down!).
Install a brand new needle.
ALWAYS RAISE the presser foot when threading.
Rethread from the beginning and verify the thread pathway is correct.
Set the upper tension to midway between High & Low numbers--you may need to tweak this for your particular machine, but this is a standard starting point.
Confirm the bobbin is loaded and threaded correctly in the bobbin case.
Begin sewing slowly. It helps if you begin sewing with the needle in the uppermost position.
Test on medium weight woven cotton.
If it is still not picking up the bobbin thread, then it most likely is a timing problem. You can search the internet for web sites and videos regarding sewing machine timing or take it for service.
Sewing Machine Thread Bunching Up Here Why
Birds nest under the fabric big loops of thread top side looks good...
What causes Bird Nests Superior Threads
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